package com.chunuo.userservice.controller;

import com.chunuo.commonutils.JwtUtils;
import com.chunuo.commonutils.R;
import com.chunuo.userservice.entity.UcenterMember;
import com.chunuo.userservice.service.UcenterMemberService;
import com.chunuo.userservice.utils.ConstantWxUtils;
import com.chunuo.userservice.utils.HttpClientUtils;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLEncoder;
import java.util.HashMap;

/**
 * 类的作用
 *
 * @author liujiamiao
 * @email 2544296058@qq.com
 * @date 2020-07-23 22:19
 */
@Controller
@RequestMapping("/api/ucenter/wx")
public class WxApiController {


    @Autowired
    private UcenterMemberService memberService;

    //2 获取扫描人信息，添加数据
    @GetMapping("callback")
    public String callback(String code, String state) throws Exception {

        //1 获取code值，临时票据，类似于验证码
        //2 拿着code请求 微信固定的地址，得到两个值 accsess_token 和 openid
        String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                "?appid=%s" +
                "&secret=%s" +
                "&code=%s" +
                "&grant_type=authorization_code";
        //拼接三个参数 ：id  秘钥 和 code值
        String accessTokenUrl = String.format(
                baseAccessTokenUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                ConstantWxUtils.WX_OPEN_APP_SECRET,
                code
        );
        //请求这个拼接好的地址，得到返回两个值 accsess_token 和 openid
        //使用httpclient发送请求，得到返回结果
        String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

        //从accessTokenInfo字符串获取出来两个值 accsess_token 和 openid
        //把accessTokenInfo字符串转换map集合，根据map里面key获取对应值
        //使用json转换工具 Gson
        Gson gson = new Gson();
        HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
        String access_token = (String)mapAccessToken.get("access_token");
        String openid = (String)mapAccessToken.get("openid");

        //把扫描人信息添加数据库里面
        //判断数据表里面是否存在相同微信信息，根据openid判断
        UcenterMember member = memberService.getOpenIdMember(openid);
        if(member == null){
            //为空则该微信还没有绑定，需要插入新数据

            //3 拿着得到accsess_token 和 openid，再去请求微信提供固定的地址，获取到扫描人信息
            //访问微信的资源服务器，获取用户信息
            String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                    "?access_token=%s" +
                    "&openid=%s";
            //拼接两个参数
            String userInfoUrl = String.format(
                    baseUserInfoUrl,
                    access_token,
                    openid
            );
            //发送请求
            String userInfo = HttpClientUtils.get(userInfoUrl);

            //获取返回userinfo字符串扫描人信息
            HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
            String nickname = (String)userInfoMap.get("nickname");//昵称
            String headimgurl = (String)userInfoMap.get("headimgurl");//头像

            member = new UcenterMember();
            member.setOpenid(openid);//微信id
            member.setNickname(nickname);//微信名称
            member.setAvatar(headimgurl);//微信头像
            memberService.save(member);
        }

        //使用jwt根据member对象生成token字符串
        String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
        //最后：返回首页面，通过路径传递token字符串
        //http://localhost:3000 ： 前端的地址
        return "redirect:http://localhost:3000?token="+jwtToken;
    }


    /**
     * 获取微信的登录二维码
     * @return
     */
    @GetMapping("login")
    public String getWeiXinCode(){

        // 微信开放平台授权baseUrl  %s相当于?代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        System.out.println(redirectUrl);
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        }catch(Exception e) {
        }
        System.out.println(redirectUrl);

        //设置%s里面值
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "chunuo"
        );

        //重定向到请求微信地址里面
        return "redirect:"+url;
    }

}
